One-to-one Definition

wŭntə-wŭn
adjective
Permitting the pairing of an element of one group with a corresponding element of another group.
Webster's New World
Designating a correspondence such that each member of a set has just one partner in another set, and no element in either is without a partner.
Webster's New World
The definition of one-to-one refers to a situation where every item has a pair.
When there is one teacher for every student, this is an example of a one-to-one ratio.
YourDictionary

(chiefly UK) Involving direct communication between two people. Used especially to refer to situations in which one person is teaching one other person.

Wiktionary

(mathematics, of a function) Injective, being an injection: having the property that no two elements of the domain are mapped to the same image.

Wiktionary
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noun

A personal relationship between two people.

Wiktionary

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one-to-one